Light reflector system

ABSTRACT

A light reflector for a light source having flat sided reflecting surfaces, the corners also being reflecting surfaces, each corner having its smallest dimension in the plane of the reflector opening and gradually widening toward the base of the reflector along lines permitting primary reflections emitting from the corners to pass directly through the reflector opening without further reflection. Additional slanted, flat side and corner pieces provide for further primary reflection emissions. Also, approximately placed light shields screen direct emissions from the light source and from primary emissions near the reflector edges without interferring with direct emissions through the center of the reflector opening.

nited States Patent McNamara, Jr.

[54] LIGHT REFLECTOR SYSTEM [72] Inventor: Albert C. McNamara, Jr.,Houston,

Tex.

[52] US. Cl ..240/103 R, 240/4135, 240/51.ll [51] Int. Cl ..F21v 7/00[58] Field ofSearch.....240/103,104, 41.35, 41.35 E,

240/4136, 78 G, 78 LD, 78 LE, 51.11, 78 LK, 41.35 F; 350/292, 299;219/347, 349

[151 3,701,898 [451 Oct. 31, 1972 Primary Examiner-Richard C. QueisserAssistant Examiner-John P. Beauchamp AttorneyArnold, White & Durkee, TomArnold, Robert A. White, Bill Durkee and Frank S. Vaden, Ill

[57] ABSTRACT A light reflector for a light source having flat sidedreflecting surfaces, the corners also being reflecting surfaces, eachcorner having its smallest dimension in the plane of the reflectoropening and gradually widening toward the base of the reflector alonglines permitting primary reflections emitting from the corners to passdirectly through the reflector opening without further reflection.Additional slanted, flat side and corner pieces provide for furtherprimary reflection emissions. Also, approximately placed light shieldsscreen direct emissions from the light source and from primary emissionsnear the reflector edges without interferring with direct emissionsthrough the center of the reflector opening.

26 Claims, 9 Drawing Figures [56] References Cited UNITED STATES PATENTS2,121,430 6/1938 Guth ..240/78 LD 2,242,590 5/1941 Moreau ..240/41.362,341,658 2/1944 Salani ..240/41.36 2,607,885 8/1952 Pfisteretal..240/l03X 2,745,001 5/1956 Guth ..240/78LD1 PATENTEDocrav I972 3. 7 01,898

' sum 1 OF 2 FIG. 1 62 PRIOR ART Albert C. McNamaraJ/t INVENTOR BY Awzd,Wm a; 0m

ATTORNEYS BACKGROUND OF THE INVENTION 1. Field of the Invention Thisinvention relates to lighting reflectors and more specifically to suchreflectors having flat sided reflecting surfaces causing at least someprimary reflections to be emitted through the opening of the reflector.

2. Description of the Prior Art It has long been standard to equip lightbulbs, both incandescent and vapor types, with reflectors to concentratelight in a generally desired direction.

The most efficient of these prior art reflectors are thosereflectorswhich are concave in shape so as to permit all light emanatingfrom the light and reflector system to be either the direct light fromthe source or to be the primary reflective light. Primary reflectivelight is that light which is reflected only once from the source beforethe light is emitted from the light and reflector system. Such a lightand reflector system that typifies this arrangement is the ordinaryflash light reflector.

Fabrication of curved surfaces, however, make the use of such reflectorsextremely expensive in many applications, particularly in systems wherethe reflectors are somewhat large, as for mounting mercury vapor lamps.Heretofore, flat sided reflectors slanting backwardly from the openinghave been used in such applications, usually presenting a rectangular orsquare opening through which much of the primary reflections areemitted. Such reflectors are relatively cheap to fabricate and assemble.However, not all of the reflections from such a reflector system areprimary reflections and therefore there is great loss in efficiency. Forinstance, all light which is not reflected initially forward is notemitted before being'reflected at least a second time. Further, evenforward reflected light which is cut off by the exit pupil of thereflector must be reflected at least a second time before emission.Finally, no light directed at the corners, either direct or from aprimary reflection, is emitted from the reflector without undergoing atleast secondary reflection.

Lack of light reflection from the comer of square reflectors hasresulted in the use of corner inserts. The conventional method ofmodifying a square-shaped reflector to provide corner reflectors is touse inserts which start at a point at the corner of a square base of thereflector and flares so that at the opening the insert is at its widestdimension. Such a structure effectively changes the square opening intoa reduced sized octogan opening and hence creates dead corner spaceswhich are not useful reflection surfaces.

It is also desirable in many installations to shield the light emissionsshining forth from the edges of the fixture, particularly when the bulbor bulbs in the fixture are not deeply recessed in the reflector. It hasbeen conventional to place smoked or otherwise translucent glass overthe opening or to place egg-crate type louvers over the entire opening.A translucent glass covering for diffusing the light over the entirearea decreases the overall efficiency of the system, requiring biggerbulbs to create the same amount of light emission. The egg-cratestructures have the same effects, not only causing the desirable lightdiffusion at the edges, but also causing undesirable light diffusion allacross the opening. In addition, the egg-crate structures accumulatedust and dirt, further reducing the amount of light reflected from thelouver surfaces as time goes by. Because -of their many compartments,such structures are also exceedingly difficult to clean.

It is thereforea feature of this invention to provide an improvedlighting reflector system comprised of flat sided segments that provideoptimum direct and primary reflections.

It is another feature of this invention to provide an improvedrectangular lighting reflector having corner pieces therein that utilizethe space of the reflector to an optimum amount and for producing moreefficient direct and primary reflection emissions than from prior artflat sided reflectors.

It 'is still another feature of the present invention to provideimproved light shields for covering the opening of a light reflector,which shields effectively block direct light and also the primaryreflections from the light source in the reflector near the edges of thereflector opening without interfering with the emissionsfrom the centerof the reflector.

SUMMARY OF THE INVENTION- A preferred embodiment of the presentinvention comprises a light reflector in which a light source may beinstalled and in which the side reflectors are flat sided, the sidereflectors establishing a rectangular opening for light emissions. Theside reflectors are 7 slanted to cause primary reflection emissions. Thecorners of the reflectors are also flat sided to permit primaryreflection from those portions which would otherwise be cut off by theexit pupil dimension of the side reflectors. These corner pieces allowthe full rectangular dimension of the opening to be utilized. Back sideand back corner pieces are also preferably included which are installedat a greater slanted angle (more parallel to the plane of the opening)than the side and corner pieces to which they are attached. These backslanted pieces cause primary reflections of the light that wouldordinarily be directed toward the back of the reflector to be insteaddirected toward the opening.

Lou versv are preferably inserted at the edges of the reflector forshielding direct light and primary reflected light without disturbingthe light emissions from the center of the opening.

BRIEF DESCRIPTION OF THE DRAWINGS So that the manner in which theabove-recited features, and various advantages and objects of theinvention which will become apparent, are attained and can be understoodin detail, more particular description of the invention brieflysummarized above may be had by reference to the embodiments thereofwhich are illustrated in the appended drawings, which drawings form apart of this specification. It is to be noted, however, that theappended drawings illustrate only typical embodiments of the inventionand are therefore not to be considered limiting of its scope, for theinvention may admit to other equally effective embodiments.

In the drawings:

FIG. 1 is a plan view of a prior art lighting reflector.

FIG. 2 is an oblique'view schematically showing how the dimensions ofthe corner pieces in a preferred embodiment of the present invention arederived.

FIG. 3 is a schematic representation showing how the exit pupildimension is derived for developing the size and placement of variousreflector pieces in the present invention.

FIG. 4 is a plan view of a preferred embodiment of 5 the presentinvention.

FIG. 5 is a schematic representation of another embodiment of thepresent invention.

FIG. 6 is a plan view of the same embodiment of the present invention asshown in FIG. 5.

FIG. 7 is a schematic representation of the shields used to block directand primary reflected light near the edges of the embodiments of theinvention shown in FIGS. 5 and 6.

FIG. 8 is a schematic representation of how an embodiment of the presentinvention may be used with a mercury vapor light source.

FIG. 9 is an exploded pictorial representation of an embodiment usedwith the mercury vapor light source that is shown in FIG. 8.

DESCRIPTION OF PREFERRED EMBODIMENTS Referring now to the drawings andfirst to FIG. 1, a light reflector is shown which has previously beenpreferred for optimizing light reflections from a reflector having asquare opening. In such a reflector, side pieces 11, 13, and 17 areslanted back from the opening to terminate in a rectangular base 19 atthe back of the reflector which is generally parallel with the plane ofthe opening through which the light is emitted. It may be assumed forpurposes of discussion that the reflector is uniformly dimensioned sothat each of the side reflectors are of the same dimension and base 19is square.

Were it not for the corner pieces to be described below, the side pieceswould have respectively met each other at corners 21, 23, 25 and 27,respectively (as shown by the dotted lines). Light from a source locatedin the center of the reflector and emitting light in all directionswould not reflect light off of a side reflector through the opening atthe corners and therefore a reflector without corner pieces at all isextremely inefficient in its corner emissions.

As is shown, increased efficiency can be developed by the insertion ofconventional type corner pieces 29, 31, 33 and 35. Corner piece 21located between side pieces 11 and 13 is in the shape of an isoscelestriangle. The corner between the two equal length sides is secured at acorner of base 19 and the other two corners terminate at the plane ofthe opening, one corner with adjacent side piece 11 and the other cornerwith adjacent side piece 13, each being displaced at the opening anequal distance from corner 21.

Each of comer pieces 31, 33 and 35 are similar in construction to cornerpiece 29. It has been demonstrated that such a structure with the cornerpieces as described is more efficient in its light emission than astructure without such corner pieces since more primary emission isdeveloped.

It should be noted that for what was originally a square shapedreflector opening, the corner pieces have reduced the effective openingarea by the amount of corner spaces 37, 39, 41 and 43. These spaces arethe triangular spaces between the edge of the corner piece and the edgeof the side pieces in the plane of the opening.

In accordance with the present invention, side pieces are developed, asshown in FIG. 4, which reflect primary light from the source through thereflector opening and which utilize the entire square opening of thereflector.

As may be shown in FIG. 2, a theoretical point source is located at 0having an image I with respect to side 50. That is, a right angleprojection from point 0 to the plane of side 50 results in point I beingestablished an equal distance from plane 50 but on the opposite sidethereof from point 0. As may be shown in FIG. 3, a cross-sectional viewof plane 50 shows clearly the right angle relationship between plane 50and the projection line, O-to-I.

As previously explained, the exit pupil is the edge of the opening onone side of which primary reflections from a light source are allowed topass and on the other side of which light rays are blocked. The exitpupil ray, therefore, is a ray along the line drawn between point I andthe escape edge of the opening. The exit pupil edge is identified withreference numeral 52.

Now turning again to FIG. 2, it is illustrated that the exit pupil raysfrom point I which are allowed to escape past opposite side 54 afterbeing reflected from side 50 are allowed to escape at corner 56 andcomer 58 of side 54 in the plane of the opening. Of course, rays alsoescape at all points between corners 56 and 58 along exit pupil edge 52.

Exit pupil rays are also permitted to escape from side 60 adjacent side50 at corner 62 between sides 50 and 60 in the plane at the opening andalong the edge between corners 62 and 56.

It will be seen that there are rays within an angle d: which are notpermitted to be emitted through the opening without being furtherreflected from side piece 60. This angle may be determined by drawing aline from image point I to corner 56, marking the intersection point 64between that line and plane 50, and then drawing a straight line fromcorner 62 through point 64.

In similar fashion it is possible to determine the angle d) forestablishing the other seven lines, such as shown in FIG. 4. That is,there will be two lines along the planes of each side reflector, onedrawn to each of the opening corners. If the reflector opening issymmetrical, and further, provided the sides all have a similar slant,then 4: will be equal for all eight lines.

Now referring to FIG. 4 in more detail, it will be seen that cornerpieces may be inserted, each corner piece being defined by two of theeight lines in adjacent side pieces. For example, corner piece 72a liesbetween side pieces a and 70d and is defined by the two lines, one oneach side piece, drawn to the common corner between side pieces 70a and70d. As shown in FIG. 4, corner pieces 70a, 70b, 70c and 70d and sidepieces 72a, 72b, 72c and 72d meet in an octogon shaped base 74.

It has been demonstrated that the configuration 5 allowed to be emittedthrough the opening of the reflector following only one reflection, aprimary reflection. This point 80 is determined by making the angle ofincidence from point to plane 50 equal to the angle of reflection suchthat the reflected ray passes through point 52.'As is well known inoptical theory, by placing I on the opposite side of plane 50 from 0,but at the same perpendicular distance therefrom, a line from I to point52 intersects plane 50 at point 80. There is no need for the reflectingsurface in plane 50 to extend beyond point 80 for this phenomenon toapply.

Rays emitted from point 0 behind point 80 (thatis, blockedby escape edge52), require at least a second bounce to be emitted. Therefore, it isrequired to insert reflecting surfaces which are at a lesser angle withrespect to the opening plane than are the original side pieces whichintersect the original side pieces at point 80 to produce furtherprimary reflections from the side. This is shown in FIG. by exiting ray82. That is, a projection from O perpendicular with back side reflector84 establishes an image point I from which primary exit pupil ray 82clearly leaves the reflector opening after only a primary reflectionfrom the light source.

When back pieces 84 are complemented with back corner pieces 86, a planview of the overall reflector will appear as shown in FIG. 6.

It has been demonstrated that the configuration shown in FIG. 6 isapproximately 6 to percent more efficient in emitting light than theconfiguration shown in FIG. 2 (FIG. 1 type of structure without anycorner reflections).

It should be noted that the reflector which is made up of all flatpieces may be fabricated without working the metal. Normally thereflective surfaces of a reflector are made of specular Alzak, whichbecomes dull the more it is worked. Cutting it into appropriate shapesdoes not dull the surface as does conforming the surface to a moldedconfiguration.

Now turning to FIG. 7, a consideration will be made of eliminating orshielding the exiting light rays near the edge of the reflector byappropriate shieldsj Assume that itis desired to block rays of lightfrom the theoretical point source at O as follows: direct lightthroughout an angle 0 and indirect light over angle [3. For the shieldlocation to block the direct light over angle 0 and the indirect lightover the angle B, appropriate louvered shields may be located atposition 88 outside of the reflector. Alternatively, shields may belocated at position 90 inside the reflector for blocking direct lightover angle 0 and at position 92 inside the reflector, both shields beingdirectly in the path of the ray desired to be blocked, and wide enoughso as to block the rays of light over the entire angle to be blocked.

For the primary reflection rays over angle beta, three locations arepossible: position 88 outside of the. reflector, position 92 inside thereflector and position 94 on the surface of the reflector itself.

It may be noted that since the rays emanating from source 0 aredifferent from the rays appearing to emanate from image point I, thelocation of louvers inside the reflectors at positions 90 and 92 willestablish placement at two different places, as previously discussed. Itshould be further noted that it is really impractical to darken thereflector at position 94 since a practical light source is not a pointand darkening part a of the reflector as indicated is not as complete ashield as can be done with louvers located either outside or inside thereflector itself. Moreover, such darkening of the reflector is onlyeffective in primary reflections and not against direct light.

Since the purpose of such louvers are to primarily block light rays overangles 0 and )3, light reflections on theback side of the louversfromthe opposite side are also blocked, but inadvertently. Therefore, itis desirable to darken the reflector at the side receiving the directrays and the primary reflection rays desired to be blocked, but to havea reflecting surface on the opposite side of each louver, that is theside closest to the side emitting primary rays which were not intendedto be blocked. These are the rays from angle a which are reflected offthe louver in position 92 as shown in FIG.

As to the desirability of placing the louvers inside versusplacing themoutside, there are wo advantages of placing them inside. The first isthatthe louvers may be somewhat smaller in dimension since they arelocated closer to the sources of emission which are desired to beblocked. Second, it is possible to cover the entire opening with a clearglass or plastic sheet so as to prevent buildup of dirt and dust on thesurfaces of the louvers, particularly the reflecting surface justdescribed. In fact, buildup of dirt and dust on an adsorptive (darkened)surface causes such dark surface to be less adsorptive than original.Hence, it is important to prevent such buildup on both sides of thelouvers. The advantage of locating the louvers on the outside of theopening are also primarily two-fold. First, only one louver at each edgemay be required. Second,

there is no inadvertent back side reflection, as

discussed above. The greater overall depth added to the reflector,however, usually dictates the inside placement of the shielding louvers.

The general principle that is demonstrated in FIG. 7 is that when thereflector is flat sided, as opposed to being curved, and is producingprimary reflections in a determinable direction, it is possible topredict the paths for these primary reflections and to place shields,such as louvers, in desired light-blocking locations. Typically, theseshields are to block the light emissions from the edge of the reflectorsystem, but for some applications it may be desirable to locate theshields elsewhere to block any predetermined angular portion of theprimary reflections from any of the flat sided reflector surfaces.

Now turning to FIGS. 8 and 9, a practical embodiment is illustratedshowing amercury vapor lamp as it may be actually carried by thereflector. Lamp is shown inserted through an opening in the reflector inone of the side reflector pieces, although it might be as well insertedfrom the back side or base 102. As is particularly shown in FIG. 9, thefixture may have a hinged frame 103 swung at hinge 104 into which aclear glass 1.06 may be inserted. At installation, louvers 1.0.8, of aninside mounting character, just described, may be inserted into thereflector opening so that the glass and frame may be closed and securedto hold the louvers within the reflector.

It should be further noted that the louver structure is comprised ofeight identical pieces to fit snugly against the slanting sides of thereflectors, the louvers being notched to receive each other and tolocate the individual louvers at the appropriate position as describedabove. Further, the edges of the louvers are slightly bevelled to matchthe mating contour of the reflector surfaces.

Although particular embodiments of the invention have been shown, itwill be understood that the invention is not limited thereto, since manymodifications may be made and will become apparent to those skilled inthe art. For example, the reflector has been described as beingrectangular, or even preferably, square. The principles described,however, are also applicable to any multi-sided reflector system. Also,each of the corner pieces have been described as merging in a cornerpoint. In an actual structure, it may be desired to have that point be aphantom point for ease of construction, operation of the reflector beingfunctionally similar to that described.

What is claimed is: l. A light reflector for carrying a mounted lightsource therein and having a rectangular opening through which light fromthe source is emitted, comprising flat first and second reflectorsslanted to cause at least some primary reflections of the source to beemitted through the opening, said reflectors aligned substantially at aright angle to each other and meeting along a line and defining a firstcorner at the opening, a flat third reflector opposite said firstreflector and meeting along a line and defining a second corner withsaid second reflector at the opening, a flat fourth reflector oppositesaid second reflector and meeting along a line and defining a thirdcorner with said first reflector at the opening, the primary reflectionexit pupil ray of said light source to said second comer intersectingsaid first reflector at a first point,

the primary reflection exit pupil ray of said light source to said thirdcorner intersecting said second reflector at a second point, and

a corner reflector defined by the plane at least approximatelyconsisting of said first comer and said first and second points.

2 A light reflector as described in claim 1, wherein said opening issubstantially square, and

another corner reflector substantially identical to said defined cornerreflector is located between said second and third reflectors, yetanother corner reflector substantially identical to said definedcornerreflector is located between said third and fourth reflectors, andstill another corner reflector substantially identical to said definedcorner reflector is located between said fourth and first reflectors.

3. A light reflector as described in claim 1, and

further including back side reflectors intersecting said first, secondand corner reflectors at lines approximately on the intersection of theprimary ;near the edges of the opening without disturbing the lightemanating from the center of the opening.

5. A light reflector as described in claim 4, wherein said shields arelouvers located inside the opening.

6. A light reflector as described in claim 5, wherein said shields arelight absorptive on the side receiving the direct light and the primaryreflective light.

7. A light reflector as described in claim 6, wherein said shieldsare-light reflective on the side opposite the side receiving the directlight and the primary reflective light.

8. A light reflector for carrying a mounted light source therein andhaving a rectangular opening through which light from the sourceemanates, comprising four reflectors slanted inwardly from the plane ofsaid opening to cause at least some primary reflections of the source toemanate through the opening, said reflectors aligned successively andsubstantially at right angles to each other in the plane of the opening,and

four corner reflectors being disposed one between each of said rightangle aligned pairs and extending inwardly from the plane of saidopening,

said corner reflectors being wedge-shaped with the smallest dimensionthereof at the opening and progressively becoming larger away from saidopening.

9. A light reflector as described in claim 8, wherein said cornerreflectors are flat and are attached to ajoining flat reflectors.

10. A light reflector as described in claim 9, and further includingback reflectors intersecting said flat and corner reflectors at linesapproximately on the intersection of the primary reflection exit pupilrays of said source and said flat and corner reflectors.

11. A light reflector as described in claim 9, and further includingshields for blocking the direct light from the source and the primaryreflective light near the edges of the opening without disturbing thelight emanating from the center of the opening.

12. A light reflector as described in claim 11, wherein said shields arelouvers located inside the opening.

13. A light reflector as described in claim 12, wherein said shields arelight absorptive on the side receiving the direct light and the primaryreflective light.

14. A light reflector as described in claim 13, wherein said shields arelight reflective on the side opposite the side receiving the directlight and the primary reflective light.

15. A light reflector for carrying a mounted light source therein andhaving an opening through which light from the source is emitted,comprising at least flrst and second adjacent reflectors meeting to forma part of said opening through which light from the source is emittedand being oriented to cause at least some primary reflections of saidlight source to be emitted through the opening, and

a third reflector extending inwardly from the plane of said opening,being adjacent at least one of said first and second reflectors andhaving sides merging toward a point at a comer of said opening, the exitpupil of each of said two adjacent reflectors permitting the forwardlydirected primary light reflections of said light source from said thirdreflector to emanate through said opening without secondary reflection.

16. A light reflector as described in claim 15,

wherein said first and second reflectors are slanted inwardly from saidopening.

17. A light reflector as described in claim 16, and

further including at least one back reflector disposed in angularrelation with said first and second reflectors for emanating with onlyprimary reflection a substantial amount of light initially directed fromsaid source away from said opening.

18. A light reflector as described in claim 16, and

further including at least one shield for blocking the direct light fromthe source and the primary reflected light near the edges of the openingwithout disturbing the light emanating from the center of the opening.

19. A light reflector as described in claim 18,

wherein said shield is a louver located inside the opening.

20. A light reflector as described in claim 16, wherein said thirdreflector is adjacent said first reflector and not adjacent said secondreflector such that the forwardly directed primary reflections from saidthird reflector directed toward the meeting of said first and secondadjacent reflectors define a boundary between said first reflector andsaid third reflector.

21. A light reflector for carrying a mounted light source and having amultisided opening through which light from the source is emitted,comprising a plurality of successively adjacent reflectors meeting toform said opening and being slanted inwardly from the plane of saidopening, and

a plurality of corner reflectors between at least some of saidsuccessively adjacent reflectors and extending inwardly from the planeof said opening, said corner reflectors having sides merging toward apoint at a corner of said opening and being oriented to reflect lightfrom said source forwardly through said openings. the exit pupil of eachof said successively adjacent reflectors at said opening permittingprimary light reflections of said light source from each of said cornerreflectors to emanate forwardly through said opening without secondaryreflection. 22. A light reflector as described in claim 21 and furtherincluding back reflectors each being disposed adjacent respective onesof said successively adjacent reflectors for emanating with only primaryreflection a substantial amount of light initially directed from saidsource away from said opening. 23. A light reflector as described inclaim 21, and further including shields for blocking the direct lightfrom the source and the primary reflected light near the edges of theopening without disturbing the light emanating from the center of theopening. 24. A light reflector as described in claim 23, wherein saidshields are louvers located inside the opening. 25. A light reflector asdescribed in claim 21,

cludes a third reflector meeting with said first reflector at saidopening, and

said plurality of corner reflectors includes a second cornerreflectoradjacent said first reflector and not adjacent said thirdreflector such that the forwardly directed primary reflections from saidsecond corner reflector directed toward the meeting of said first andthird reflectors define a boundary between said first reflector and saidsecond corner reflector.

1. A light reflector for carrying a mounted light source therein andhaving a rectangular opening through which light from the source isemitted, comprising flat first and second reflectors slanted to cause atleast some primary reflections of the source to be emitted through theopening, said reflectors aligned substantially at a right angle to eachother and meeting along a line and defining a first corner at theopening, a flat third reflector opposite said first reflector andmeeting along a line and defining a second corner with said secondreflector at the opening, a flat fourth reflector opposite said secondreflector and meeting along a line and defining a third corner with saidfirst reflector at the opening, the primary reflection exit pupil ray ofsaid light source to said second corner intersecting said firstreflector at a first point, the primary reflection exit pupil ray ofsaid light source to said third corner intersecting said secondreflector at a second point, and a corner reflector defined by the planeat least approximately consisting of said first corner and said firstand second points.
 2. A light reflector as described in claim 1, whereinsaid opening is substantially square, and another corner reflectorsubstantially identical to said defined corner reflector is locatedbetween said second and third reflectors, yet another corner reflectorSubstantially identical to said defined corner reflector is locatedbetween said third and fourth reflectors, and still another cornerreflector substantially identical to said defined corner reflector islocated between said fourth and first reflectors.
 3. A light reflectoras described in claim 1, and further including back side reflectorsintersecting said first, second and corner reflectors at linesapproximately on the intersection of the primary reflection exit pupilrays of said source and said first, second and corner reflectors.
 4. Alight reflector as described in claim 1, and further including shieldsfor blocking the direct light from the source and the primary reflectivelight near the edges of the opening without disturbing the lightemanating from the center of the opening.
 5. A light reflector asdescribed in claim 4, wherein said shields are louvers located insidethe opening.
 6. A light reflector as described in claim 5, wherein saidshields are light absorptive on the side receiving the direct light andthe primary reflective light.
 7. A light reflector as described in claim6, wherein said shields are light reflective on the side opposite theside receiving the direct light and the primary reflective light.
 8. Alight reflector for carrying a mounted light source therein and having arectangular opening through which light from the source emanates,comprising four reflectors slanted inwardly from the plane of saidopening to cause at least some primary reflections of the source toemanate through the opening, said reflectors aligned successively andsubstantially at right angles to each other in the plane of the opening,and four corner reflectors being disposed one between each of saidright-angle aligned pairs and extending inwardly from the plane of saidopening, said corner reflectors being wedge-shaped with the smallestdimension thereof at the opening and progressively becoming larger awayfrom said opening.
 9. A light reflector as described in claim 8, whereinsaid corner reflectors are flat and are attached to ajoining flatreflectors.
 10. A light reflector as described in claim 9, and furtherincluding back reflectors intersecting said flat and corner reflectorsat lines approximately on the intersection of the primary reflectionexit pupil rays of said source and said flat and corner reflectors. 11.A light reflector as described in claim 9, and further including shieldsfor blocking the direct light from the source and the primary reflectivelight near the edges of the opening without disturbing the lightemanating from the center of the opening.
 12. A light reflector asdescribed in claim 11, wherein said shields are louvers located insidethe opening.
 13. A light reflector as described in claim 12, whereinsaid shields are light absorptive on the side receiving the direct lightand the primary reflective light.
 14. A light reflector as described inclaim 13, wherein said shields are light reflective on the side oppositethe side receiving the direct light and the primary reflective light.15. A light reflector for carrying a mounted light source therein andhaving an opening through which light from the source is emitted,comprising at least first and second adjacent reflectors meeting to forma part of said opening through which light from the source is emittedand being oriented to cause at least some primary reflections of saidlight source to be emitted through the opening, and a third reflectorextending inwardly from the plane of said opening, being adjacent atleast one of said first and second reflectors and having sides mergingtoward a point at a corner of said opening, the exit pupil of each ofsaid two adjacent reflectors permitting the forwardly directed primarylight reflections of said light source from said third reflector toemanate through said opening without secondary reflection.
 16. A lightreflector as described in claim 15, wherein Said first and secondreflectors are slanted inwardly from said opening.
 17. A light reflectoras described in claim 16, and further including at least one backreflector disposed in angular relation with said first and secondreflectors for emanating with only primary reflection a substantialamount of light initially directed from said source away from saidopening.
 18. A light reflector as described in claim 16, and furtherincluding at least one shield for blocking the direct light from thesource and the primary reflected light near the edges of the openingwithout disturbing the light emanating from the center of the opening.19. A light reflector as described in claim 18, wherein said shield is alouver located inside the opening.
 20. A light reflector as described inclaim 16, wherein said third reflector is adjacent said first reflectorand not adjacent said second reflector such that the forwardly directedprimary reflections from said third reflector directed toward themeeting of said first and second adjacent reflectors define a boundarybetween said first reflector and said third reflector.
 21. A lightreflector for carrying a mounted light source and having a multisidedopening through which light from the source is emitted, comprising aplurality of successively adjacent reflectors meeting to form saidopening and being slanted inwardly from the plane of said opening, and aplurality of corner reflectors between at least some of saidsuccessively adjacent reflectors and extending inwardly from the planeof said opening, said corner reflectors having sides merging toward apoint at a corner of said opening and being oriented to reflect lightfrom said source forwardly through said opening, the exit pupil of eachof said successively adjacent reflectors at said opening permittingprimary light reflections of said light source from each of said cornerreflectors to emanate forwardly through said opening without secondaryreflection.
 22. A light reflector as described in claim 21, and furtherincluding back reflectors each being disposed adjacent respective onesof said successively adjacent reflectors for emanating with only primaryreflection a substantial amount of light initially directed from saidsource away from said opening.
 23. A light reflector as described inclaim 21, and further including shields for blocking the direct lightfrom the source and the primary reflected light near the edges of theopening without disturbing the light emanating from the center of theopening.
 24. A light reflector as described in claim 23, wherein saidshields are louvers located inside the opening.
 25. A light reflector asdescribed in claim 21, wherein said plurality of successively adjacentreflectors includes first and second reflectors meeting at said opening,and said plurality of corner reflectors includes a reflector adjacentsaid first reflector and not adjacent said second reflector such thatthe forwardly directed primary reflections from said flat cornerreflector directed toward the meeting of said first and secondreflectors define a boundary between said first reflector and said flatcorner reflector.
 26. A light reflector as described in claim 25,wherein said plurality of successively adjacent reflectors includes athird reflector meeting with said first reflector at said opening, andsaid plurality of corner reflectors includes a second corner reflectoradjacent said first reflector and not adjacent said third reflector suchthat the forwardly directed primary reflections from said second cornerreflector directed toward the meeting of said first and third reflectorsdefine a boundary between said first reflector and said second cornerreflector.